batgrbproduct analysis for trigger=894268
batgrbproduct Analysis for Trigger=894268
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Mar 23 13:57:21 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger894268/GCN5_download_cron
======================================================================
Trigger: 00894268 Segment: 000
BAT Trigger Time: 574945008 [s; MET]
Trigger Stop: 574945672 [s; MET]
UTC: 2019-03-22T10:56:25.388020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 314.656159012122 Dec: 41.7848259084663 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.7
Flight Position: [ source = BAT ]
RA: 314.656159012122 Dec: 41.7848259084663 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 314.725171800589 Dec: 41.8401469769342 [deg; J2000]
{ 20h 58m 54.0s , +41d 50' 24.5" }
+/- 3.49384879562716 [arcmin] (estimated 90% radius based on SNR)
+/- 1.97664845500559 [arcmin] (formal 1-sigma fit error)
SNR: 5.09295286930934
Angular difference between Flight and Ground position is 4.532372 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 664 +/-
Measured from: 0
to: 664 [s; relative to TRIGTIME]
T50: 664 +/-
Measured from: 0
to: 664 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 664 second)
Measured from: 0
to: 664 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 664 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.429023 1.560670 0.401075 -0.123328
0.199469 0.208434 0.187330 0.181189 [error]
Peak 1.429023 1.560670 0.401075 -0.123328
0.199469 0.208434 0.187330 0.181189 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 4.05e-07 4.80e-07 4.10e-07 5.95e-07 1.51e-06 1.89e-06 erg/cm2
Error 7.96e-08 9.12e-08 1.40e-07 3.72e-07 3.38e-07 5.77e-07 erg/cm2
Peak flux Power-law 2.00e-02 1.31e-02 5.60e-03 3.28e-03 4.04e-02 4.20e-02 ph/cm2/s
Error 3.99e-03 2.43e-03 1.85e-03 1.92e-03 6.97e-03 7.49e-03 ph/cm2/s
Fluence Cutoff-PL 4.14e-07 6.24e-07 9.87e-09 7.65e-15 1.05e-06 1.05e-06 erg/cm2
Error 8.61e-08 1.20e-07 1.86e-08 2.52e-12 1.67e-07 1.67e-07 erg/cm2
Peak flux Cutoff-PL 1.90e-02 1.86e-02 1.72e-04 6.92e-11 3.78e-02 3.78e-02 ph/cm2/s
Error 4.08e-03 3.77e-03 3.11e-04 2.26e-08 5.72e-03 5.72e-03 ph/cm2/s
Fluence Band 4.34e-07 6.30e-07 1.28e-07 2.34e-08 1.22e-06 1.22e-06 erg/cm2
Error 8.82e-08 1.00e-07 -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.226 0.311 - - 2.40e-04 6.17e-05 80.720 57
CPL -10.000 -2.679 27.4 1.8 1.25e+05 1.37e+05 55.780 56
The chi2 of BB fit is 64.40 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.226 0.311 - - 2.40e-04 6.17e-05 80.720 57
CPL -10.000 -2.679 27.4 1.8 1.25e+05 1.37e+05 55.780 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 664.000 0.000 664.000
T90 664.000 0.000 664.000
T50 664.000 0.000 664.000
Peak 664.000 0.000 664.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
314.7252 +41.8401 0.0378 13.4 57.5 3.5478 5.1 TRIG_00894268
------------------------------------------
Foreground time interval of the image:
0.000 664.000 (delta_t = 664.000 [sec])
Background time interval of the image:
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 664.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22641 ( -0.295422 0.32614 )
Norm@50keV : 2.40373E-04 ( -6.14139e-05 6.20611e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.72 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 57 degrees of freedom
# Null hypothesis probability = 2.106848e-02
Photon flux (15-150 keV) in 664 sec: 4.03508E-02 ( -0.00695433 0.00697756 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50569e-06 ( -3.26737e-07 3.49233e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 664.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( 10 4.64244 )
Epeak [keV] : 27.3857 ( -1.78584 1.89227 )
Norm@50keV : 1.24520E+05 ( -124518 149631 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 0.9961 for 56 degrees of freedom
# Null hypothesis probability = 4.830642e-01
Photon flux (15-150 keV) in 664 sec: 3.78111E-02 3.75939E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47441e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 664.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.94671 -5 )
beta : -4.65964 ( 4.65595 1.44745 )
Epeak [keV] : 27.6775 ( -2.46888 2.52237 )
Norm@50keV : 32.6379 ( -4.96409 28.7827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.45 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Null hypothesis probability = 3.844475e-01
Photon flux (15-150 keV) in 664 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21526e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.19506 (-0.919942 1.09594)
R^2/D10^2 : 7.61384E-02 (-0.0335221 0.0563714)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.40 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.336485e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.322e-07 1.150e-07
25- 50 6.240e-07 1.736e-07
50-150 1.141e-07 6.395e-08
15-150 1.170e-06 2.902e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.3858 (-11.2003 19.7304)
Norm : 0.287879 (-0.0749102 0.103115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.88 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 57 degrees of freedom
# Null hypothesis probability = 6.574810e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.241e-07 9.698e-08
25- 50 5.347e-07 1.472e-07
50-150 3.717e-07 2.010e-07
15-150 1.331e-06 3.971e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.27523 (-7.25679 -7.25679)
R1^2/D10^2 : 4.28617E-02 (-0.0429582 -0.0429582)
kT2 [keV] : 7.10654 (-7.15001 -7.15001)
R2^2/D10^2 : 3.29361E-02 (-0.0330965 -0.0330965)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.40 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.807196e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.316e-07 5.163e-01
25- 50 6.247e-07 3.685e+00
50-150 1.149e-07 1.078e+02
15-150 1.171e-06 1.074e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 664.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.22641 ( -0.295422 0.32614 )
Norm@50keV : 2.40373E-04 ( -6.14139e-05 6.20611e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.72 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 57 degrees of freedom
# Null hypothesis probability = 2.106848e-02
Photon flux (15-150 keV) in 664 sec: 4.03508E-02 ( -0.00695433 0.00697756 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50569e-06 ( -3.26737e-07 3.49233e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 664.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( 10 4.64244 )
Epeak [keV] : 27.3857 ( -1.78584 1.89227 )
Norm@50keV : 1.24520E+05 ( -124518 149631 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.78 using 59 PHA bins.
# Reduced chi-squared = 0.9961 for 56 degrees of freedom
# Null hypothesis probability = 4.830642e-01
Photon flux (15-150 keV) in 664 sec: 3.78111E-02 3.75939E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47441e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 664.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.94671 -5 )
beta : -4.65964 ( 4.65595 1.44745 )
Epeak [keV] : 27.6775 ( -2.46888 2.52237 )
Norm@50keV : 32.6379 ( -4.96409 28.7827 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.45 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Null hypothesis probability = 3.844475e-01
Photon flux (15-150 keV) in 664 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21526e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.19506 (-0.919942 1.09594)
R^2/D10^2 : 7.61384E-02 (-0.0335221 0.0563714)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.40 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.336485e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.322e-07 1.214e-07
25- 50 6.240e-07 1.741e-07
50-150 1.141e-07 6.139e-08
15-150 1.170e-06 2.686e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.3858 (-11.2003 19.7304)
Norm : 0.287879 (-0.0749102 0.103115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.88 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 57 degrees of freedom
# Null hypothesis probability = 6.574810e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.241e-07 9.465e-08
25- 50 5.347e-07 1.530e-07
50-150 3.717e-07 2.275e-07
15-150 1.331e-06 4.014e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.27523 (-7.25679 -7.25679)
R1^2/D10^2 : 4.28617E-02 (-0.0429582 -0.0429582)
kT2 [keV] : 7.10654 (-7.15001 -7.15001)
R2^2/D10^2 : 3.29361E-02 (-0.0330965 -0.0330965)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.40 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.807196e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.316e-07 4.452e-01
25- 50 6.247e-07 4.638e+00
50-150 1.149e-07 9.233e+01
15-150 1.171e-06 1.015e+02
Plot creation:
Sat Mar 23 14:02:58 EDT 2019